/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.nop.core.command.args;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * A simple representation of command line arguments, broken into "option arguments" and "non-option arguments".
 *
 * @author Chris Beams
 * @see SimpleCommandLineArgsParser
 * @since 3.1
 */
public class CommandLineArgs {

    private final Map<String, List<String>> optionArgs = new HashMap<>();
    private final List<String> nonOptionArgs = new ArrayList<>();

    /**
     * Add an option argument for the given option name and add the given value to the list of values associated with
     * this option (of which there may be zero or more). The given value may be {@code null}, indicating that the option
     * was specified without an associated value (e.g. "--foo" vs. "--foo=bar").
     */
    public void addOptionArg(String optionName, String optionValue) {
        if (!this.optionArgs.containsKey(optionName)) {
            this.optionArgs.put(optionName, new ArrayList<>());
        }
        if (optionValue != null) {
            this.optionArgs.get(optionName).add(optionValue);
        }
    }

    public Map<String, Object> getArgs() {
        Map<String, Object> args = new LinkedHashMap<>();
        optionArgs.forEach((name, value) -> {
            if (name.equals("command"))
                return;

            if (value.isEmpty()) {
                args.put(name, "");
            } else {
                args.put(name, value.get(0));
            }
        });
        return args;
    }

    /**
     * Return the set of all option arguments present on the command line.
     */
    public Set<String> getOptionNames() {
        return Collections.unmodifiableSet(this.optionArgs.keySet());
    }

    /**
     * Return whether the option with the given name was present on the command line.
     */
    public boolean containsOption(String optionName) {
        return this.optionArgs.containsKey(optionName);
    }

    /**
     * Return the list of values associated with the given option. {@code null} signifies that the option was not
     * present; empty list signifies that no values were associated with this option.
     */
    public List<String> getOptionValues(String optionName) {
        return this.optionArgs.get(optionName);
    }

    /**
     * Add the given value to the list of non-option arguments.
     */
    public void addNonOptionArg(String value) {
        this.nonOptionArgs.add(value);
    }

    /**
     * Return the list of non-option arguments specified on the command line.
     */
    public List<String> getNonOptionArgs() {
        return Collections.unmodifiableList(this.nonOptionArgs);
    }

    public boolean isSubCommand(String command) {
        if (this.nonOptionArgs.isEmpty())
            return false;
        return command.equals(nonOptionArgs.get(0));
    }
}
